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| Cd2+ Adsorption Properties of Fe-modified Biochar and Its Environmental Sustainability Evaluation |
| Received:August 07, 2025 Revised:August 20, 2025 |
| DOI：10.11981/j.issn.1000-6842.2026.02.61 |
| Key Words:Fe-modified biochar;pyrolysis temperature;Cd2+ adsorption;life cycle assessment （LCA） |
| Fund Project:陕西地建-西安交大土地工程与人居环境技术创新中心开放基金（201912131-D6）。 |
| Author Name | Affiliation | Postcode | | WEI Yuxin* | Technology Innovation Center for Land Engineering and Human Settlements， Shaanxi Land Engineering Construction Group Co.，Ltd. and Xi’an Jiaotong University， School of Human Settlements and Civil Engineering， Xi’an Jiaotong University， Xi’an， Shaanxi Province， 710049 | 710049 | | LIU Kuankuan | Technology Innovation Center for Land Engineering and Human Settlements， Shaanxi Land Engineering Construction Group Co.，Ltd. and Xi’an Jiaotong University， School of Human Settlements and Civil Engineering， Xi’an Jiaotong University， Xi’an， Shaanxi Province， 710049 | 710049 | | CHEN Jiayang | Technology Innovation Center for Land Engineering and Human Settlements， Shaanxi Land Engineering Construction Group Co.，Ltd. and Xi’an Jiaotong University， School of Human Settlements and Civil Engineering， Xi’an Jiaotong University， Xi’an， Shaanxi Province， 710049 | 710049 | | WANG Junqi* | Technology Innovation Center for Land Engineering and Human Settlements， Shaanxi Land Engineering Construction Group Co.，Ltd. and Xi’an Jiaotong University， School of Human Settlements and Civil Engineering， Xi’an Jiaotong University， Xi’an， Shaanxi Province， 710049 | 710049 |
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| Abstract: |
| In this study， poplar wood was used as the raw material to prepare biochar （BC） under various pyrolysis temperatures and times. Iron was introduced via an Fe impregnation-calcination method to modify the biochar. The adsorption behavior of Fe-modified biochar towards Cd²⁺ was systematically investigated. Additionally， a life cycle assessment （LCA） was conducted to analyze the environmental impacts of different process routes in terms of global warming potential， acidification potential， and ecological toxicity. The results showed that increasing pyrolysis temperature significantly enhanced specific surface area and adsorption capacity of Fe-modified biochar， while reducing the number of oxygen-containing functional groups on its surface. The theoretical saturated adsorption capacity of Fe-BC， prepared at 600 ℃， was 25.432 mg/g. LCA analysis revealed that the route of 400 ℃ and 30 min imposed the lowest environmental burden， removing 1 mg Cd2+ resulted in a global warming potential of only 0.10 kg CO2 eq， whereas the high-temperature pyrolysis processes enhanced the adsorption performance at the cost of higher environmental impacts. |
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